Attorney Mark Hummels dies after being critically injured by Arthur Douglas Harmon in a Phoenix office shooting, has died. He is the second of three people wounded in the attack. Mark Hummels had been on life support after Wednesday morning’s shooting. Steven Singer, a Scottsdale-based Fusion Contact Centers LLC’s chief executive officer was also killed. Arthur Douglas Harmon committed suicide.

Steven Singer’s company had hired Arthur Douglas Harmon to refurbish office cubicles at two call centers in California. The shooting was targeted and not random. Mark Hummels worked with law firm Osborn Maledon and focused on business disputes, real estate litigation and malpractice defense.